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dm bufio: relax alignment constraint on slab cache 

The I/O buffer doesn't have to be aligned on block size granularity,
relax alignment to ARCH_KMALLOC_MINALIGN (required to allow DMA from
slab cache memory on some architectures).

Also, set SLAB_RECLAIM_ACCOUNT so that the memory allocated from the
cache is accounted as reclaimable and doesn't inflate the 'used' entry
in the free command.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2018-03-15 17:22:00 -04:00 committed by Mike Snitzer
parent 21bb132767
commit 6b5e718cc1
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-bufio.c
View File

@ -618,7 +618,6 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t sector,
unsigned this_step = min((unsigned)(PAGE_SIZE - offset_in_page(ptr)), len);
if (!bio_add_page(&b->bio, virt_to_page(ptr), this_step,
offset_in_page(ptr))) {
BUG_ON(b->c->block_size <= PAGE_SIZE);
use_dmio(b, rw, sector, n_sectors, offset, end_io);
return;
}
@ -1686,7 +1685,8 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
if (block_size < PAGE_SIZE) {
char name[26];
snprintf(name, sizeof name, "dm_bufio_cache-%u", c->block_size);
c->slab_cache = kmem_cache_create(name, c->block_size, c->block_size, 0, NULL);
c->slab_cache = kmem_cache_create(name, c->block_size, ARCH_KMALLOC_MINALIGN,
SLAB_RECLAIM_ACCOUNT, NULL);
if (!c->slab_cache) {
r = -ENOMEM;
goto bad;